Here is another vote for multiple set ups. I used to run a pair of 20" for forward trolling like the article said. I've also got a 56" for other applications. Each bag has it's own purpose. I would suggest the 2 bag trolling set up and a larger bag for all other applications.

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"Don't tell me the sky is the limit when there are footprints on the moon."

Today I was out trying to get my kicker in order. 9.9 Suzuki 4 stroke on the back of a Lund 1800 Explorer. With the kicker running just fast enough to keep it from dying out, I can slow to 2mph (gps). I tossed out a 24" sock and slowed to 1.6-1.8. Pulled that in and put on the bigger sock (I think its 36, but maybe 40") and that only got me in the 1.0-1.2 range. These speeds were trolling with the wind, which was 5-7 mph. I'm thinking of doing a prop change and buying 2 bags and rigging them as shown on the Lindy site. Trolling in any greater of a wind and I'lll be back where I started. I can believe this boat wont slow down more......

Thunder,
If you have a relatively short run to your fishing grounds and can go slower to your fishing grounds, you can put a prop on your boat that is several inches lower in pitch than you are currently running. At the same time, go to as large diameter as will fit within the constraints of the motors cavitation plate.

The large flat pitch prop disk will give you a slower speed, and will give you the ultimate in boat control.

For example, if you are running a 15 pitch prop and go to a 10 pitch prop, you will likely decrease your trolling speed from 2 to about 1.

You will also cut your top speed by about 1/3rd, and you will have to keep an eye on your tach to avoid over revving the motor.

Rook,
You nailed it.
Yes, I have a set of these bag and use them all of the time. Simple and easy to use.

There are quite a few trollers on the pro circuit that have used them as well with great success.

In addition, if you only have a short run from your boat launch to fishing grounds and can stand to go more slowly, you can go to a much lower pitch prop than you normally use.

Lets say that you normally run a 15 pitch prop and get 2 mph during a troll.
If you go to a 10 pitch prop, you will be only trolling at about 1 mph during a troll at the same engine rpm.
You will lose top speed, and you will have to keep an eye on the tach to prevent overrevving. But if slow trolling is your goal with little hassle, have a low pitched prop that you put on when trolling.